On Mon, 12 Oct 2015, Julien Grall wrote: > On 12/10/15 11:41, Stefano Stabellini wrote: > > On Thu, 8 Oct 2015, Ian Campbell wrote: > >>> If the concern is the behavior is changed, I'm happy to rework this code > >>> to keep exactly the same behavior. I.e any 32-bit write containing > >>> a 0 byte will be ignored. This is not optimal but at least I'm not > >>> opening the pandora box of fixing every single error in the code touch > >>> by this series. > >> > >> I'm okay with the new behaviour, I think Stefano was willing to tolerate it > >> (based on <alpine.deb.2.02.1510081220190.1...@kaball.uk.xensource.com>). > >> > >> So if we aren't going to fix it to DTRT WRT writing zero to a target then I > >> think we can go with the current variant and not change to ignoring any > >> word with a zero byte in it. > > > > OK. > > > > BTW it would be interesting to see how real hardware behaves in this > > regard. I seem to recall that X-Gene was ignoring 0 writes too. > > What do you mean by 0 writes? Is it the write ignored if one byte is 0?
Yes, for either 32bit or 8bit writes. > Although, it's really depend if you try on a target register where all > the byte correspond to an implemented field or not. I am talking about implemented fields _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
